Calculate the number of fatigue cycles corresponding to the combinations of init

Question

Calculate the number of fatigue cycles corresponding to the combinations of initial and final crack radius for a semicircular surface flaw tabulated below. Assume that the crack radius is small compared to the cross section of the structure. Discuss the relative sensitivity of the fatigue life to initial crack size and final crack size, respectively. The material constant is C=6.87x10-12, and m=3. the stress range ??=200 MPa. Initial crack radius Final crack radius 1 mm 10 mm 1 mm 20 mm 2 mm 10 mm 2 mm 20 mm For a semicircular crack, the formula to calculate the stress intensity factor is K(I )=0.636 *?* square roo [a] Im having trouble with this problem, I would greatly appreciate the help.

Explanation / Answer

The number of fatigue cycles corresponding to the combinations of initial and final crack radius for a semicircular surface tabulated below is ranfing from 2 to 6 refer : http://media.routledgeweb.com/pdf/9780415346221/FMExercises.pdf

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